BOC signal capturing method based on CCRW

Abstract

The invention relates to a BOC signal capturing method based on CCRW. According to the method, a Bump-Jump method is adopted on the basis of realizing unambiguous capture of BOCs (m, n) signals and BOCc (m, n) signals by adopting a special local code waveform and combining a non-coherent dot product detection method, and a lead related branch and a lag related branch are added, so error locking is avoided, and unambiguous capture of the BOC signals is realized. According to the method, after the Bump-Jump method is adopted, the error lock probability of BOC signal non-fuzzy capture is smaller than that of a traditional Bump-Jump method which is directly adopted; according to the method, fuzzy-free capture can be achieved with small carrier-to-noise ratio attenuation, and the performance is superior to that of a traditional capture method.

Description

technical field [0001] The present application relates to the technical field of satellite navigation signal reception, in particular to a CCRW-based BOC signal acquisition method. Background technique [0002] Modern satellite navigation systems, including GPS, Galileo, and Beidou global satellite navigation systems, all use BOC signals in order to improve the utilization of navigation frequency bands and suppress signal multipath errors. Due to the use of subcarrier modulation, the correlation function of the BOC signal exhibits multi-peak characteristics. The traditional Doppler-code two-dimensional search capture is prone to miscapture and is not suitable for the capture of BOC signals. Therefore, the unambiguous capture technology has been extensively studied. . A variety of BOC signal ambiguity-free capture technologies represented by Bump-Jump method, BPSk-like method, single-sideband capture method, and side peak elimination method have been proposed at home and abr...

AI Technical Summary

Problems solved by technology

The Bump-Jump method and the BPSk-like method are two common BOC signal capture techniques. Both of them can solve the fuzzy capture of BOC signals, but both require additional auxiliary means. The former requires a pair of additional lead / lag tributaries to ensure that no false captures occur, which consume additional filter resources

Since the SSB capture method only uses half of the spectrum, the performance of the demodulated signal will be reduced, and the measurement accuracy cannot be improved.

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